I'm going to buy me a Fenix PD30 R2+, I don't know much about flashlights so I was wondering wich batteries i should use, Standard or rechargeable (CR123A). So can anyone tell me if rechargeable batteries go off while not in use (in the flashlight/out the flashlight). And do they work as long as standard batteries. Wich brand do you advice to me, aswell standard as rechargeable. Or is there anything I should know about batteries ? Thanx :twothumbs